Blooming cot composition



April 7, 1970 D. J. BURKEY 3,505,267

BLOOMING COT COMPOSITION Filed July 28. 1967 INVENTOR DAVID J. BURKEY ATTORNEY United States Patent 3,505,267 BLOOMING COT COMPOSITION David J. Burkey, 177 N. Duke St, Millersville, Pa. 17551 Filed July 28, 1967, Ser. No. 656,785 Int. Cl. C08c 11/54; B01h /80 U.S. Cl. 26030.8 3 Claims ABSTRACT OF THE DISCLOSURE BACKGROUND OF THE INVENTION Field of the invention The invention relates generally to textile fiber drafting elements of the kind used in modern drawing, roving, and spinning machines.

Description of the prior art Many prior drafting elements are made of leather. In recent years, synthetic compositions, particularly of oilresistance synthetic rubbers, have tended to replace leather textile roll coverings and aprons. The new compositions have given improved performance regarding lapping-up and eyebrowing over the prior leather compositions. A variety of oil-resistant synthetic rubber compositions has been described, particularly those which eliminate accumulation of static electricity on the drafting elements. The static charge on these elements has allowed accumulation and sticking of fibers on the elements, such sticking being the primary cause of lapping-up.

The advent of modern fiber such as the extensible or stretchable, smooth-surface fibers has produced new problems. Such fibers adhere firmly to a cot surface in the absence of any static charge.

Hence, there is a need for a textile fiber drafting cot composition which eliminates the possibility of such adhesion of some of the new synthetic fibers.

SUMMARY OF THE INVENTION The invention relates to a textile fiber drafting cot having an improved non-adhesive drafting surface for extensible, smooth-surfaced fibers of polyamide and polyester types. The cot composition comprises a sulfur-cured butadiene-acrylonitrile copolymer and filler. The composition also includes as the critical ingredient therein 5-35 parts by weight of toluene sulfonamide per 100 parts by weight of the butadiene-acrylonitrile copolymer. This amount of toluene sulfonamide will bring about a bloom to the surface of the cot. This bloom on the surface of the cot eliminates the adhesive properties normally found on the surface of the oil-resistant synthetic rubber cot compositions even Where a static charge is not involved.

BRIEF DESCRIPTION OF THE DRAWING The drawing shows a typical textile fiber drafting cot in which the metal arbor 1 is the core of the drafting cot 2 having the drafting surface 3 on which is a bloom of toluene sulfonamide.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The oil-resistant synthetic rubber to be used in cots of the present invention will be NBR rubbers, the butadieneacrylonitrile copolymers containing normally 25-40% by weight acrylonitrile in the copolymer. The toluene sulfonamide is sufiiciently incompatible with thi particular rubber to bloom to the surface of the cot. By bloom is meant that the incompatibility of the toluene sulfonamide is sufficient that the sulfonamide diffuses to the surface of the cot at a rate slow enough to be effective over the working life of the cot and fast enough to affect the drafting surface characteristics of the cot.

The NB R rubbers will be blended with other ingredients standard in the cot composition art. Particularly, there will 'be reinforcing fillers in the nature of carbon black. Softeners in the nature of polyethylene glycol or polyether dibutoxyethoxyethylformate may be added, along with such customary additives as glue, and detergents and wetting agents such as polyethylene glycol monolaurate to impart anti-static properties to the drafting surface of the cot. Clays (such as kaolin), zinc oxide, pigments, retarders (such as salicylic acid), may all be used.

A sulfur-containing curing system willbe used to cure the rubber. Such systems often include sulfur itself along with accelerators such as benzothiazyl disulfide, N-nitroso diphenylamine, 2-benzothiazole sulphenamide, and the like. Often additional resins such as coumarone-indene resins are added as tackifier resins. In short, the cot composition may be a conventional NBR composition, With the toluene sulfonamide as an additional ingredient. All of the ingredients are blended into the NBR rubber in the usual manner as by milling or intensive mixing, followed by the formation of a cot by extrusion. The cots are then cured and ground to size as customary.

The toluene sulfonamide to be added to the composition may be in the form of the ortho or para isomer. As a practical matter, mixtures of ortho and para may be cheaper than either isomer alone, and hence may be more desirable to use. The formulate for the two isomers are as follows:

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para ortho The blooming of the toluene sulfonamide to the surface of the cot prevents the sticking of extensible smooth-surfaced synthetic fibers such as the polyamides and the polyesters. These fibers stretch slightly during drafting and adhere to the surfaces of cots during drafting through a mechanism that appears to be simple adhesion rather than electrical; static charges appear to have nothing to do with the adhesion of these types of fibers to the cot surfaces. The minute film of toluene sulfonamide that has bloomed to the surface of the NBR composition renders the drafting surface of the cot completely non-adhesive for these fibers. Tests have shown that cots manufactured according to the present invention function for twelve months with reduced lapping-up, giving superior performance to NBR cots which do not contain the toluene sulfonamide.

The amount of toluene sulfonamide should be in the range of 5-35 parts by weight toluene sulfonamide per parts by Weight NBR rubber. As a practical matter, 15 parts by weight toluene sulfonamide per 100 parts by weight NBR rubber will give a good working all-around composition.

The following example illustrates two embodiments of the invention.

3 EXAMPLE Two compositions having the following formulations were prepared on a rubber mill.

Ingredients: Parts by weight Butadiene-acrylonitrile copolymer, 32-34% by The second formulation is as follows.

Ingredients: Parts by weight Butadiene-acrylonitrile copolymer, 38% acrylnitrile 100 Sulfur 10 Carbon black 0.3 Castor oil plus sulfur 10 Polyethylene glycol 1.5 Finely divided silicone dioxide 30 Kaolin 20 Zinc oxide Benzothiazyl disulfide 2 N-nitroso diphenylamine 2 Brown pigment 2 Titanium dioxide 15 Liquid coumarone-indene resin Toluene sulfonamide I claim:

1. A composition having an improved no-adhesive drafting surface for extensible, smooth-surfaced fibers of the polyarnide and polyester type, said composition comprising a sulfur-cured butadiene-acrylonitrile copolymer and filler, and including 535 parts by weight toluene sulfonamide per parts by weight of said copolymer sufficient to bloom to the surface of the composition.

2. A composition according to claim 1 containing 15 parts by weight toluene sulfonamide per 100 parts by weight of said copolymer.

3. A composition according to claim 1 wherein said filler comprises carbon black.

References Cited UNITED STATES PATENTS 2,089,569 8/ 1937 Orthner et a1.

2,386,583 10/1945 Bacon 29l32 X 2,416,668 3/1947 Schroeder 26030.8 X

2,466,826 4/1949 Romaine 260 -308 X 2,469,348 5/1949 Young et a1 26030.8 X

3,092,895 6/1963 Batkin et al 29-132 MORRIS LIEBMAN, Primary Examiner R. H. ZAITLEN, Assistant Examiner U.S. Cl. X.R.

(22 5 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,5 5,2 7 Dated Apr l 7, 1970 Inventor(s) David Burke? It is certified that error a and that said Letters Patent are ppears in the above-identified patent hereby corrected as shown below:

In the title block at the beginning of the first column of the application, the patent omits the citation of Armstrong cork c mpany as the asaignee. An assignment by David J. Burkey to Armstrong Cork Company was filed it March 1968 and was duly recorded. on Reel 23 6, Frame 59 0f the assit records. we asst shmld have been applied to the file of this application and the patent should have issued to David J. Burkey as assignor to Armstrong Cork Company.

001mm 1-, line 2, or the printed patent, the word "no-adhesive" should read "non-adhesive".

SIGNED AND SEALED AUG 251970 (SEAL) Attest:

Edward M. Fletcher, Jr. $111M E- SGHUYLER, JR.

1 c t. Ams i Offi miss om or Paten a 

